@segment/analytics-next/dist/pkg/core/query-string/pickPrefix.js

Analytics Next (aka Analytics 2.0) is the latest version of Segment’s JavaScript SDK - enabling you to send your data to any tool without having to learn, test, or use a new API every time.

/**
 * Returns an object containing only the properties prefixed by the input
 * string.
 * Ex: prefix('ajs_traits_', { ajs_traits_address: '123 St' })
 * will return { address: '123 St' }
 **/
export function pickPrefix(prefix, object) {
    return Object.keys(object).reduce(function (acc, key) {
        if (key.startsWith(prefix)) {
            var field = key.substr(prefix.length);
            acc[field] = object[key];
        }
        return acc;
    }, {});
}
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